I live in Brazil and I bought in London a Notebook with the DVD RW ND-6500A. When I play my DVD CD's the sound does not work (with audio CD's it's OK). I suppose that this problem is due to the fact that it is set to DVD Region 1 and Brazil is Region 4. When I try to change with Control Panel in the Windows-XP, it appears an error message which says that it's unable to update region setting and recomends to make sure that de drive contains Region 4 Media and I have administration privilege. Can you help me to solve this problem? With my best regards.